The AXI switch uses a QoS scheme to control priorities in the switch and the DDR controller. The QoS is a 4-bit value and a higher QoS value represents a higher priority.
Each master generates a QoS as listed in the following table.
| Port | Master | Master Directly supports QoS (Yes/No) | QoS Source |
|---|---|---|---|
| 1 | FIC0-FM | Yes | Sourced from fabric |
| 2 | FIC1-FM | Yes | Sourced from fabric |
| 3 | FIC2-FM | Yes | Sourced from fabric |
| 4 | Crypto Processor | No | Set by System register, the value is fixed once set |
| 5 | GEM0 | Yes | Set by Ethernet MAC |
| 6 | GEM1 | Yes | Set by Ethernet MAC |
| 7 | USB | No | Set by System register, the value is fixed once set |
| 8 | MMC | No | Set by System register, the value is fixed once set |
| 9 | SCB Bridge | Yes | Set in System Controller SCB interface |
| 10 | CPLEX-D0 | No | Set by System register, the value is fixed once set |
| 11 | CPLEX-D1 | No | Set by System register, the value is fixed once set |
| 12 | CPLEX-F0 | No | Set by System register, the value is fixed once set |
| 13 | CPLEX-F1 | No | Set by System register, the value is fixed once set |
| 14 | CPLEX-NC | No | Set by System register, the value is fixed once set |
| 15 | TRACE | Yes | Set by Trace SMB |